Design And Implementation Of TTE Real-Time Monitoring System

In recent years,with the development of science and technology,real-time security systems such as national defense,aerospace,industrial control,and transportation have become more and more demanding on the real-time performance of network transmission.However,traditional Ethernet only provides "best effort" transmission characteristics,which cannot meet the requirements of high real-time performance and high reliability.This has brought new challenges to network researchers,and has become a hot issue in academic and industrial research,and new solutions are emerging.Time Triggered Ethernet(TTE),which is compatible with traditional Ethernet and offers real-time transmission capabilities,stands out from many solutions and attracts high attention in the aerospace industry,and the academic community conducted a preliminary demonstration of this technology.TTE implements the determinism mechanism,fault tolerance mechanism and real-time performance of time-triggered technology,requiring high-precision clock synchronization technology.Mainstream Ethernet time synchronization technologies mainly include three time synchronization protocols: NTP,IEEE1588,and AS6802.The synchronization accuracy of NTP no longer meets the requirements.TTE related project in our laboratory adopts the IEEE1588 and AS6802 synchronization protocols to achieve high-precision synchronization of the network.In order to monitor and demonstrate the TTE switches and end systems that we independently designed and developed,we developed a graphical interface software on the PC to monitor the clock synchronization function and service forwarding function of the TTE switch based on the FPGA platform through the network port.It is convenient for hardware designers to observe the working status of the system.This paper introduces the relevant research background and significance in combination with the laboratory TTE related research projects.Combined with the needs of the project,the paper focuses on the overall design and implementation of the software part of the synchronous state monitoring system.First,a detailed analysis of the project requirements,from the hardware and software communication workflow,the design of the proprietary communication protocol and the software design architecture,etc.;then the underlying communication module of the synchronization state monitoring software,data to the model the mapping,data display module and other functional modules propose detailed design schemes and implementations.Finally,functional and performance tests are performed on the synchronization state monitoring software through software and hardware joint debugging to verify the feasibility and function of the project.At present,the TTE monitoring system has been applied to the debugging and demonstration of the laboratory TTE project.It can monitor the synchronous working status of IEEE1588 or AS6802 in real time,and can also monitor the status of various TT services and ET services in real time.The monitoring interface has a large amount of information.The various working conditions are clear and intuitive.